Arch construction for fire boxes



July 29. 1924.

G. c. DENNEY ARCH CONSTRUCTION FOR FIRE BOXES Filed Nov. 26.

INVENTOR.

Patented July 29, 1924.

" STATES 1,503,231 PATENT oFFicE- GUY GARLETON DENNEY, F HINSDALE, ILLINOIS, AS SIGNOR- T0 AMERICAN ARCH COMPANY, A CORPORATION OF DELAXVAREL. I

1 ARCH CONSTRUCTION FOR FIRE BOXES Application filed November 26, 1920. Serial No. 426,347.

To all whom it may concern.

Be it known that I, GUY CARLnroN DEN- NEY, a citizen of the United States, residing at Hinsdale, in the county of Du Page and State of Illinois, have invented certain new and useful Improvements in Arch Constructions for Fir Boxes, of which the following is a specification.

This invention relates to refractory arches or baffies for boiler fire boxes and particularly to such constructions as applied to the boxes of locomotive boilers. Many locomotive boiler arch constructions are supported upon circulation or arch tubes. and my improvements are directed to arches so supported.

It is customary practice to construct the arches of a plurality of bricks and it is the particular object of my invention to adapt a single style and size of brick to a wide variety of tube settings, that is, tube settings in which the spaces between tubes vary considerably within reasonable limits. More specifically stated my invention contemplates the provision of a plurality of brick supporting members adapted to rest upon the tubes and to carry the bricks of the arch on their upper faces. the ends of the bricks and the said brick supporting 39 faces of the supporting members being so constructed as to make possible the utilization of one size of brick between pairs of tubes which are differently spaced. My invention also contemplates the provision of a construction in which one and the same style andisize of brick may be used to form both the side or wing portions of the arch which extend from the outside tubes to the side sheets and the middle portions extending between tubes.

My invention is particularly applicable to arch constructions wherein the middle bricks are substantially fiat and of sufiicient length to span the distance between tubes,

and I have illustrated my invention in a preferred form in the accompanying drawing, wherein- Figure 1 is a somewhat diagrammatical longitudinal section through a locomotive boiler fire box equipped with an arch embodying my invention taken through the arch as indicated by the line 1-1 in Fig. 2; Figure 2 is a section on the line 22 of Figure 1 and illustrates the invention as it would be applied to the minimum tube spacing possible for a given size brick; Figure 3 is a section taken similarly to that of Figure 2 but illustrating the maxi mum tube spacing to which bricks of'a given size can be applied; and Figure l is a fragmentary sectional view taken similarly to those of Figures 2 and 3 but illustrating a slightly different method of applying and supporting the side bricks.

Referring to the drawing it will be seen that I have illustrated a locomotive fire box A of usual construction comprising the crown sheet 1, the flue sheet 2 extending downwardly into the throat sheet 3-, the inside back sheet 4:, the outside back sheet 5, the inside side sheets 6 and 7, the forward water leg 8, and the rear water leg 9. A pluralit of tubes 10 connect the two water legs. our tubes are shown, but it will be obvious hereinafter that my invention could be applied to fire boxes provided with either a greater or a lesser number of tubes. I

A plurality of substantially triangular prismatic brick supporting members 11 are arranged on the tubes 10 with their apices upward and their sloping sides extending longitudinally of the tubes and of the fire box. The base 12 of each of these members is provided with a tube engaging sockst or recess 13 and at each side at the bottom are provided small projections 13. The apex or crest may be flat or cut away as indicated at 14. The construction of the members 11 is such that when mounted upon the tubes they present oppositely sloping bricksupporting surfaces 15.

The prismatic bricks 16 forming the arch are substantially trapezoidal in shape, their parallel faces, 17 and 18, being so disposed that the non-parallel faces or legs 19 have a slope complementary to the slope of the inclined supporting faces 15.

The arch is built up by first placing the supporting members 11 on the tubes, after which the bricks 16 are applied with the shorter face 18 downward. If the tubes are spaced relatively closely together as in Figure 2 the sloping sides or legs 19 will contact with the sloping surfaces 15 to form a support for the brick on the upper portion of such surfaces 15. But if the tubes are spaced farther apart, as shown in Figure 3, the bricks 1-6 will ride downwardly and supporting contacts will be made on the 2 represents substantially minimum tube spacing and Figure 3substantially maximum tube spacing for a given size brick. In any case, the brick 16 wedge between the supporting members 11. It will readily be apparent that all intermediate spacings could be taken care of by the. same size brick.

Whatever the variant spacing of the tubes 10, moreover, the supporting members 11 are free and adapted to turn or pivot on the respective single tubes where on they rest, so as to adjust themselves to positions affording the best contact at 15 19 and the most perfect general stability and equilibrium for the aggregate'of parts 11, 16 composing the arch span.

In Figures 2 and 3 the side or-wing portions of the arch are shown as composed of bricks 16 each arranged with the shorter face upwardly and with one leg 19 contacting with a surface 15 and with one end, of. the face 17 resting againstthe side sheet. The projection 13 holds the bricks in place.

'VVhen the middle bricks'16 project below the base 12 of the supporting members. as in Figure 3, these projections 18 are chipped 'or broken off.

In Fi ure 4.- I have illustrated another ar- C rangement for supporting the side or wing bricks. In this arrangement the shorter face 18 is placed downwardly and one leg 19 is shown as contacting with asurface 15 and the other leg 19 as resting upon a stud 20 in the side sheet 7 The construction is simple easily installed and readily applicable to a wide variety of and ends being adapted to contact in support of the brick in various spaced relations of the supporting members.

2. In a locomotive fire box having spaced arch supporting members, an arch comprising prismatic brick-supporting members adapted to rest and pivot upon single arch supporting members and bricks adapted to span the distance between arch supporting DIBlTlbQS and to rest at each end on the brick supporting members, said brick supporting members and said bricks being pro vided with oppositely inclined surfaces where contact is made between them, so that spaces of different dimension between arch supporting members can be spanned by bricks of one size.

3. In a locomotive lire box having arch tubes, the combination of a plurality of triangular brick-supporting members laterally pivoted on single tubes with the crest uppermost and sloping sides extending longitudinally of the lire box. and a plurality of bricks having end portions provided with con'iplementary sloping surfaces said bricks being adapted to be supported by the brick supporting members with the sloping sides in contact, so that bricks of one size can be accommodated to variant spaces between tubes.

4. In a locomotive [ire boX having arch tubes, an arch comprising triangular members laterally supported and free to pivot on single tubes and trapezoidal members supported from and between the aforesaid members.

5. In a locomotive fire box having arch tubes, component members for constructing an arch comprising pairs of cooperating members one of which is substantially triangular and constructed to be laterally supported and pivoted on a single tube and the other of which is substantially trapezoidal and adapted to have an inclined face thereof supported from a complementary inclined face on the aforesaid member..

In testimony whereof I have hereun signed my name. I

GUY CARLETON DENNEY. 

